 Marburger also presided over the commissioning of the Relativistic Heavy Ion Collider, expanded the lab's program in medical imaging and neuroscience, and placed more emphasis on its technology transfer program.The tritium leak, combined with other disclosures about improper handling and disposal of hazardous waste, had caused Secretary of Energy Federico Peña to fire the lab's previous manager, Associated Universities, Inc.Upon starting as the laboratory's director, Marburger noted the increased importance of health and environmental concerns since the beginning of the Cold War, stating that "getting the people at Brookhaven to understand that won't be simple, and there may be some disagreement on how we should do it, but that's my job."